title: Perichiasmatic granuloma occuring after radical mastoidectomy: MR findings.
abstract: A case of chronic chemical meningitis occurring after a radical mastoidectomy is reported. Imaging and surgical findings were suggestive of a dissemination of cholesteatoma debris within the subarachnoid spaces. Chemical meningitis has been described in epidermoid and dermoid cyst rupture. This report illustrates that clinicians should be aware of this possible complication. Skull base imaging is mandatory before considering the diagnosis of idiopathic meningitis. Only treatment of the abnormal communication between cerebrospinal fluid and middle ear may eradicate the origin of this rare meningitis.
authors.affiliation: Hôpital Saint-Antoine, Service de Radiologie, 184 rue du Faubourg Saint-Antoine, F-75012 Paris, France.
authors.forename: H
authors.initials: H
authors.lastname: Djouhri
authors.forename: K
authors.initials: K
authors.lastname: Marsot-Dupuch
authors.forename: A
authors.initials: A
authors.lastname: Joutel
authors.forename: M
authors.initials: M
authors.lastname: Kujas
authors.forename: M D
authors.initials: MD
authors.lastname: Brette
authors.forename: F
authors.initials: F
authors.lastname: Artuis
authors.forename: J M
authors.initials: JM
authors.lastname: Tubiana
mesh_terms: D000328:Adult; D018424:Cholesteatoma, Middle Ear / Q000150:complications* / Q000601:surgery; D005260:Female; D006099:Granuloma / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000209:etiology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008416:Mastoid / Q000601:surgery*; D008582:Meningitis, Aseptic / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000209:etiology*; D009897:Optic Chiasm; D011183:Postoperative Complications; D012008:Recurrence; D013346:Subarachnoid Space; D014057:Tomography, X-Ray Computed